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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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SECONDARY INDEX IN INNODB The patches for Bug#11751388 and Bug#11784056 enabled concurrent reads while creating secondary indexes in InnoDB. However, they introduced a regression. This regression occured if ALTER TABLE failed after the index had been added, for example during the lock upgrade needed to update .FRM. If this happened, InnoDB and the server got out of sync with regards to which indexes actually existed. Therefore the patch for Bug#11815600 again disabled concurrent reads. This patch re-enables concurrent reads. The original regression is fixed by splitting the ADD INDEX operation into two parts. First the new index is created but not made active. This is done while concurrent reads are allowed. The second part of the operation makes the index active (or reverts the change). This is done after lock upgrade, which prevents the original regression. In order to implement this change, the patch changes the storage API for in-place index creation. handler::add_index() is split into two functions, handler_add_index() and handler::final_add_index(). The former for creating indexes without making them visible and the latter for commiting (i.e. making visible) new indexes or reverting the changes. Large parts of this patch were written by Marko Mäkelä. Test case added to innodb_mysql_lock.test. |
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MySQL Server 5.5 This is a release of MySQL, a dual-license SQL database server. For the avoidance of doubt, this particular copy of the software is released under the version 2 of the GNU General Public License. MySQL is brought to you by Oracle. Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. License information can be found in the COPYING file. MySQL FOSS License Exception We want free and open source software applications under certain licenses to be able to use specified GPL-licensed MySQL client libraries despite the fact that not all such FOSS licenses are compatible with version 2 of the GNU General Public License. Therefore there are special exceptions to the terms and conditions of the GPLv2 as applied to these client libraries, which are identified and described in more detail in the FOSS License Exception at <http://www.mysql.com/about/legal/licensing/foss-exception.html>. This distribution may include materials developed by third parties. For license and attribution notices for these materials, please refer to the documentation that accompanies this distribution (see the "Licenses for Third-Party Components" appendix) or view the online documentation at <http://dev.mysql.com/doc/>. GPLv2 Disclaimer For the avoidance of doubt, except that if any license choice other than GPL or LGPL is available it will apply instead, Oracle elects to use only the General Public License version 2 (GPLv2) at this time for any software where a choice of GPL license versions is made available with the language indicating that GPLv2 or any later version may be used, or where a choice of which version of the GPL is applied is otherwise unspecified. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some Reference Manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section. - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the MySQL Change History appendix. You can browse the MySQL Reference Manual online or download it in any of several formats at the URL given earlier in this file. Source distributions include a local copy of the manual in the Docs directory.